Adjustable die



(N Model) i F. ARMSTRONG.

ADJUSTABLE DIE,

No. 469,622. Patented Feb. 23, 1892.

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p UNITED STATES PATENT OFFICE.

FRANK ARMSTRONG, OF BRIDGEIORT, CONNECTICUT.

ADJUSTABLE-DIE.

SPECIFICATION forming part of Letters Patent No. 469,622, dated February23, 1892. Application filed May 7, 1891. Renewed February 2, 1892.Serial No. 420,039. (No model.)

I all whom t may concern.-

Be it known that I, FRANK ARMSTRONG, a citizen of the United States,residing at Bridgeport, in the county of Fairfield and State ofConnecticut, have invented certain new and useful Improvements inAdjustable Dies; and I do hereby declare the following to be afull,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

This invention relates to certain new and useful improvements inadjustable' dies for threading rods, pipes, and the like; and the objectof my invention is to produce a device of this description adapted foruse either upon a rotary machine-head or upon a diestock and which shallbe capable of adjustment to accommodate various sizes of work;

and with these ends in view my invention consists in the constructionand combination of elements hereinafter fully explained, and thenrecited in the claims.

In order that those skilled inthe art to which my invention appertainsmay fully understand how to make and use my improved die, I will nowdescribe the same in detail, reference being had to the accompanyingdrawings and the numerals marked thereon, which form a part of thisspecification.

Figure 1 shows four of my improved dies in plan View upon a rotativemachine-head. Fig. 2 is a partial horizont-al section. Fig, 3 is an endview of the die-block with the die and operating-screw removed, and Fig.4 a side elevation of the die.

In Fig. 1 the fastening-screw is left out of one of the die-blocks toshow the shape of the hole in the die-block. The die-block l is made ofsteel or iron, preferably of the shape shown at Figs. 2 and 3. Afastening-hole 2 extends through the block from top to bottom to providefor its attachment either to a machine-head t, such as is shown at Fig.l, or to an ordinary die-stock. The means of attachment may be thescrews 5 or other suitable fastening. In the die-block 1 is cut a seat3, having near its bottom a sidewise recess 6, and in the seat isarranged a die 7, held as against vertical displacement by a fin 8,engaging with the recess 6. Said die is also provided with acutting-edge 9 and with a partial screw-thread 10 in one side. Alongsidethe seat just referred to and opening into it at one side is ascrew-seat 1l, which at its rear end, in diminished size, passesentirely through the die-block. In this is held a screw l2, meshing withthe partial thread on the die 7. Said screw is held in position by meansof a cross-pin 13, engaging a groove in the screw, and the shank of thelatter, which is provided with a drive-slot, extends through the hole inthe die-block, so as to be accessible from the rear end. The top of thedie 7 is provided with a standard mark 14, and upon the abutting edge ofthe block are further standard marks 15, indicating the measurements.

In operating my invention two or more of the die-blocks are secured uponthe die-stock or machine head. The dies are then, by means of theoperating-screw, moved in their seats until the standard marks indicatethat their cutting-faces are at the required distance apart. The diesmay then be used for performing any required work, but may be shiftedfrom one size to another by means of a screw-driver applied to the screw12,wl1ich is capable of moving the die backward and forward in the seat.As the screw is of low pitch it not only moves the die, but holds itfirmly as against displacement;

I claim- 1. The combination, with the die-block having means for itsattachment to the stock or head, of a die seated in said block andmovable therein, and a screw having its axis parallel to the length ofthe die and engaging and adapted to operate and also to hold the latter,substantially as described.

2. The combination, with the die-block having the seat, as described, ofthe die arranged in said seat and provided with a partial thread in oneedge, a screw seated in the die-block parallel to and engaging with thethreads upon the die, and means accessible from without the die-blockfor the operation of the screw.

3. The combination, with the die-block having means for attachment tothe head and abutting edges of the die and block, substantially asdescribed.

In testimony whereof I aix my signature in presence of two Witnesses.

. FRANK ARMSTRONG. Witnesses:

SHERMAN HARTWELL HUBBARD, BUNNA C. HINCHCLIFFE.

